hifi engine

Service manual of Nakamichi CR-5A/E

By replacing the reel motor with dead spot of my Nakamichi CR-5A i have break a black wire soldering. This black wire comes from DD capstan motor Ass'y(from back view of this Ass'y : There are 4 black wires and the right of row 2 comes to ??? for soldering.)
could someone help me indentifying to right point to solder correctly or maybe upload the service manual of CR-5A/E for my wiring study?